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I am a results-driven Senior Full Stack Engineer with over 5 years of experience in architecting and delivering secure, scalable systems, primarily in FinTech and blockchain. I am adept in Java, Spring Boot, Flutter, and React Native, with deep knowledge of smart contract orchestration, Web 3 integration, and microservice-based architectures. Passionate about building clean, performant APIs, solving complex backend challenges, and elevating team velocity through mentorship and modern software delivery workflows. Over my career, I've led frontend and backend development for secure trading platforms and mobile wallets, engineered blockchain infrastructure for real-time monitoring and smart contract event tracking, and integrated complex investor workflows with Web 3 components. I focus on creating reusable modules and improving system performance, while contributing to robust CI/CD pipelines in agile and cross-functional team environments.…I am a results-driven Senior Full Stack Engineer with over 5 years of experience in architecting and delivering secure, scalable systems, primarily in FinTech and blockchain. I am adept in Java, Spring Boot, Flutter, and React Native, with deep knowledge of smart contract orchestration, Web 3 integration, and microservice-based architectures. Passionate about building clean, performant APIs, solving complex backend challenges, and elevating team velocity through mentorship and modern software delivery workflows. Over my career, I've led frontend and backend development for secure trading platforms and mobile wallets, engineered blockchain infrastructure for real-time monitoring and smart contract event tracking, and integrated complex investor workflows with Web 3 components. I focus on creating reusable modules and improving system performance, while contributing to robust CI/CD pipelines in agile and cross-functional team environments.

Hein Htet Zaw

Full Stack Developer, Back-End Developer, Blockchain Developer, +2

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I am a results-driven Senior Full Stack Engineer with over 5 years of experience in architecting and delivering secure, scalable systems, primarily in FinTech and blockchain. I am adept in Java, Spring Boot, Flutter, and React Native, with deep knowledge of smart contract orchestration, Web 3 integration, and microservice-based architectures. Passionate about building clean, performant APIs, solving complex backend challenges, and elevating team velocity through mentorship and modern software delivery workflows. Over my career, I've led frontend and backend development for secure trading platforms and mobile wallets, engineered blockchain infrastructure for real-time monitoring and smart contract event tracking, and integrated complex investor workflows with Web 3 components. I focus on creating reusable modules and improving system performance, while contributing to robust CI/CD pipelines in agile and cross-functional team environments.…I am a results-driven Senior Full Stack Engineer with over 5 years of experience in architecting and delivering secure, scalable systems, primarily in FinTech and blockchain. I am adept in Java, Spring Boot, Flutter, and React Native, with deep knowledge of smart contract orchestration, Web 3 integration, and microservice-based architectures. Passionate about building clean, performant APIs, solving complex backend challenges, and elevating team velocity through mentorship and modern software delivery workflows. Over my career, I've led frontend and backend development for secure trading platforms and mobile wallets, engineered blockchain infrastructure for real-time monitoring and smart contract event tracking, and integrated complex investor workflows with Web 3 components. I focus on creating reusable modules and improving system performance, while contributing to robust CI/CD pipelines in agile and cross-functional team environments.

Available to hire

I am a results-driven Senior Full Stack Engineer with over 5 years of experience in architecting and delivering secure, scalable systems, primarily in FinTech and blockchain. I am adept in Java, Spring Boot, Flutter, and React Native, with deep knowledge of smart contract orchestration, Web 3 integration, and microservice-based architectures. Passionate about building clean, performant APIs, solving complex backend challenges, and elevating team velocity through mentorship and modern software delivery workflows.

Over my career, I’ve led frontend and backend development for secure trading platforms and mobile wallets, engineered blockchain infrastructure for real-time monitoring and smart contract event tracking, and integrated complex investor workflows with Web 3 components. I focus on creating reusable modules and improving system performance, while contributing to robust CI/CD pipelines in agile and cross-functional team environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Intermediate

Thai

Beginner

Work Experience

Senior Software Engineer at IMMIN Pte. Ltd.

April 30, 2025 - August 8, 2025

Architected and delivered a full-stack CEX/DEX trading platform using Flutter, Spring Boot (GraphQL), and a reactive Java blockchain listener on a private Ethereum Besu network. Led frontend development with Riverpod, creating a secure mobile wallet with biometric key storage and reusable modules that significantly accelerated team velocity. Engineered backend services for on-chain smart contract orchestration and built Jenkins/Docker CI/CD pipelines to automate deployment and reduce release risk. Boosted block-processing throughput by 3x by migrating a core service to a reactive architecture. Delivered a production-ready secure mobile wallet enabling safe, user-controlled transactions with biometric authentication. Developed core infrastructure for real-time block monitoring and smart contract event tracking to enable future enterprise-scale onboarding.

Senior Full Stack Engineer at SDAX Capital Markets Pte. Ltd.

June 1, 2022 - August 8, 2025

Architected scalable backend microservices using Spring Boot, building secure REST and GraphQL APIs to support a Flutter-based client and orchestrate complex investor workflows including KYC and token issuance. Engineered the data persistence layer using JPA/Hibernate and MongoDB, designing high-availability data models for institutional and retail user management. Integrated Web 3 to drive on-chain operations, creating reusable modules for smart contract deployment and transaction processing adopted across services. Built synchronous event pipelines with Kafka and RabbitMQ to handle real-time blockchain events across services. Implemented comprehensive testing strategy with JUnit and Postman, contributed to CI/CD pipelines in an agile, cross-functional team. Reduced API response times by 40% by refactoring core services and optimizing database access patterns. Decreased test failures by 60% by establishing robust contract validation and regression testing strategies. Sped up blockchai

Software Engineer at XALLET

September 1, 2021 - August 8, 2025

Built secure React Native wallet features, improving user onboarding and trust. Integrated Kraken APIs for real-time balance, crypto trading, and exchange functions. Implemented interactive cryptographs to monitor market movements. Developed secure, scalable Node.js + GraphQL APIs for mobile clients. Delivered full Kraken integration with reliable trading capabilities. Boosted graph rendering performance by 2×, improving app responsiveness. Improved security posture and contributed to Xallet’s platform growth.